File:Paramount Cabinaire with Townend ring Aero Digest September,1930.jpg - Wikimedia Commons
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File:Armstrong Whitworth AW.154 Argosy with townend ring L'Aéronautique July,1929.jpg - Wikimedia Commons
THE TOWNEND RING
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THE TOWNEND RING
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Townend ring - Wikipedia
THE TOWNEND RING
